An estimate of higher twist at small x and low Q^2 based upon a saturation model

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dc.creatorBartels, J.
dc.creatorGolec-Biernat, K.
dc.creatorPeters, K.
dc.date2000-03-06
dc.date2001-02-28
dc.date.accessioned2026-07-07T10:52:00Z
dc.date.available2026-07-07T10:52:00Z
dc.descriptionWe investigate the influence of higher twist corrections to deep inelastic structure functions in the low-$Q^2$ and small-$x$ HERA region. We review the general features of the lowest-order QCD diagrams which contribute to twist-4 at small-$x$, in particular the sign structure of longitudinal and transverse structure functions which offers the possibility of strong cancellations in $F_2$. For a numerical analysis we perform a twist analysis of the saturation model which has been very successful both in describing the structure function and the DIS diffractive cross section at HERA. As the main conclusion, twist 4 corrections are not small in $F_L$ or $F_T$ but in $F_2=F_L + F_T$ they almost cancel. This indicates the limitation on the use of the DGLAP formalism at small $x$ and $Q^2$. We point out that $F_L$ analysis needs a large twist-4 correction. We also indicate the region of validity of the twist expansion.
dc.description15 pages, latex, ps figures, replaced with the journal version
dc.identifierhttps://arxiv.org/abs/hep-ph/0003042
dc.identifierhttp://arxiv.org/abs/hep-ph/0003042
dc.identifierEur.Phys.J.C17:121-128,2000
dc.identifierdoi:10.1007/s100520000429
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/185011
dc.subjectHigh Energy Physics - Phenomenology
dc.titleAn estimate of higher twist at small x and low Q^2 based upon a saturation model
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